CN111560560A - Method for centrifugally casting high-strength nodular cast iron cylinder sleeve - Google Patents
Method for centrifugally casting high-strength nodular cast iron cylinder sleeve Download PDFInfo
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- CN111560560A CN111560560A CN202010620981.5A CN202010620981A CN111560560A CN 111560560 A CN111560560 A CN 111560560A CN 202010620981 A CN202010620981 A CN 202010620981A CN 111560560 A CN111560560 A CN 111560560A
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- 238000000034 method Methods 0.000 title claims abstract description 65
- 238000005266 casting Methods 0.000 title claims abstract description 64
- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 51
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 156
- 229910052742 iron Inorganic materials 0.000 claims abstract description 78
- 238000004321 preservation Methods 0.000 claims abstract description 68
- 238000003723 Smelting Methods 0.000 claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 238000009750 centrifugal casting Methods 0.000 claims description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 239000011651 chromium Substances 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 239000011733 molybdenum Substances 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 239000011574 phosphorus Substances 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 239000011593 sulfur Substances 0.000 claims description 6
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 4
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 4
- 150000002910 rare earth metals Chemical class 0.000 claims description 4
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 3
- 238000010923 batch production Methods 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 5
- 229910001060 Gray iron Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- APGROBRHKCQTIA-UHFFFAOYSA-N [Mg].[Si].[Fe] Chemical compound [Mg].[Si].[Fe] APGROBRHKCQTIA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
- C21C1/105—Nodularising additive agents
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D5/00—Heat treatments of cast-iron
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a method for centrifugally casting a high-strength nodular cast iron cylinder sleeve, which comprises the steps of proportioning, smelting, spheroidizing, pouring, cooling and preserving heat; spheroidizing: carrying out spheroidization on the molten iron before spheroidization by using a wire feeding spheroidization method to obtain spheroidized molten iron; pouring: introducing the spheroidized molten iron into a coreless air pressure heat-preservation pouring furnace, and injecting the spheroidized molten iron into a centrifugal pouring machine through the coreless air pressure heat-preservation pouring furnace; and pouring into the pouring mold by using a centrifugal pouring machine to obtain the cylinder sleeve casting. The invention has simple process and convenient operation; the wire feeding spheroidization method is used for spheroidization, so that the artificial influence of the spheroidization process is reduced; the coreless air pressure heat-preservation pouring furnace is used, molten iron after spheroidization can be continuously injected into the multi-station centrifugal pouring machine for a long time, the yield is improved, the production cost is reduced, and batch production is realized while the production efficiency is ensured.
Description
Technical Field
The invention relates to the technical field of cylinder liner production, in particular to a method for centrifugally casting a high-strength nodular cast iron cylinder liner.
Background
In order to adapt to more severe engine emission standards, the engine needs to improve the explosion pressure more greatly to meet requirements, the tensile strength of a cylinder sleeve product required by the engine needs to reach more than 600MPa, the traditional gray cast iron cylinder sleeve cannot meet the requirements, the steel cylinder sleeve is high in tensile strength but also high in manufacturing cost, and cannot meet the use requirements of high performance and low cost of the cylinder sleeve.
The nodular cast iron has the performance of iron and intrinsic steel, and is very suitable for the requirements of high-standard engines on cylinder liners. However, the material of the nodular cast iron is fundamentally different from that of the gray cast iron, so that the traditional production process of the centrifugal casting high-strength nodular cast iron cylinder sleeve cannot be well matched with a multi-station centrifugal casting machine, and the condition of mass production cannot be met. The traditional production process flow of centrifugally casting the high-strength nodular cast iron cylinder sleeve is as follows: molten iron before smelting and spheroidizing in an intermediate frequency furnace, preserving heat in a cored holding furnace, carrying out spheroidizing treatment by a flushing method, and carrying out casting production by a multi-station centrifugal casting machine. In the process flow, when the amount of spheroidized molten iron is large, the problems of spheroidization recession and temperature drop can occur in 10 minutes when the spheroidized molten iron which is not completely poured; when the amount of spheroidized molten iron is less, the spheroidized molten iron cannot be matched with a multi-station centrifugal casting machine for use; moreover, the spheroidization quality is greatly influenced by human factors, the spheroidization operation time is long, the production rhythm of a multi-station centrifugal casting machine cannot be kept up with, and the large-batch, stable and continuous production cannot be realized.
Disclosure of Invention
The invention aims to overcome the defects and provide a method for centrifugally casting a high-strength nodular cast iron cylinder sleeve.
In order to achieve the purpose, the invention is implemented according to the following technical scheme:
a method for centrifugally casting a high-strength nodular cast iron cylinder sleeve comprises the following steps:
(1) preparing materials: proportioning according to the raw material components of the nodular cast iron cylinder sleeve to obtain furnace burden of the nodular cast iron cylinder sleeve;
(2) smelting: smelting the nodular cast iron cylinder sleeve furnace charge by using an intermediate frequency furnace to obtain molten iron before spheroidization;
(3) spheroidizing: carrying out spheroidization on the molten iron before spheroidization by using a wire feeding spheroidization method to obtain spheroidized molten iron;
(4) pouring: introducing the spheroidized molten iron into a coreless air pressure heat-preservation pouring furnace, and injecting the spheroidized molten iron into a centrifugal pouring machine through the coreless air pressure heat-preservation pouring furnace; pouring into a pouring mold by a centrifugal pouring machine to obtain a cylinder sleeve casting;
(5) cooling and heat preservation: cooling the cylinder sleeve casting, and then putting the cylinder sleeve casting into a heat preservation furnace for heat preservation; and (5) after heat preservation, obtaining the nodular cast iron cylinder sleeve.
Preferably, the nodular cast iron cylinder sleeve is made of the following raw materials in percentage by weight: 3.6-4.0% of carbon, 2.0-2.6% of silicon, 0.6-0.9% of manganese, less than or equal to 0.06% of phosphorus, less than or equal to 0.025% of sulfur, less than or equal to 0.08% of chromium, 0.3-0.7% of molybdenum, 0.9-1.0% of nickel, 0.1-0.2% of copper and the balance of iron.
Preferably, in the smelting process of the step (2), the smelting temperature is 1500-1550 ℃.
Preferably, in the spheroidization process in the step (3), a wire feeding spheroidization device is used for spheroidization of the molten iron before spheroidization; and the spheroidization process adopts core-spun yarns for spheroidization.
Preferably, the wire feeding spheroidization method comprises the following steps of adding molten iron before spheroidization into a wire feeding spheroidization ladle, and automatically transferring the ladle into a wire feeding spheroidization treatment station for spheroidization; the wire feeding speed of the core-spun wire is 10-20 m/min; the cored wire reacts with molten iron to roll the molten iron; the total wire feeding amount of the core-spun yarn is 0.6-0.75% of the total amount of the molten iron before spheroidization, and the spheroidization is finished after the wire feeding is finished; the temperature of molten iron after spheroidizing is 1400-1450 ℃.
Preferably, the core-spun yarn is a rare earth silicon iron magnesium alloy core-spun yarn.
Preferably, in the casting process in the step (4), the furnace temperature of the coreless air pressure heat-preservation casting furnace is kept at 1380-1420 ℃, and nitrogen is introduced into the coreless air pressure heat-preservation casting furnace for protection.
Preferably, the centrifugal speed of the centrifugal casting machine when casting into the casting mould is 600-650 r/min.
Preferably, the centrifugal casting machine is a multi-station centrifugal casting machine.
Preferably, the cast cylinder sleeve casting is cooled to 300-500 ℃ after demolding; placing the cooled cylinder sleeve casting into a heat preservation furnace for heat preservation, wherein the heat preservation time is 60-180 minutes, and discharging the cylinder sleeve casting when the heat preservation temperature is not more than 300 ℃; and discharging to obtain a finished product of the nodular cast iron cylinder sleeve.
The invention has the following function principle:
the method mainly comprises the steps of material mixing, smelting, spheroidizing, casting, cooling and heat preservation. The smelting adopts an intermediate frequency furnace for smelting, the spheroidization adopts wire feeding spheroidization, and a coreless air pressure heat-preservation pouring furnace is adopted in the pouring process. Briefly, the following process can be described: molten iron before smelting and spheroidizing in an intermediate frequency furnace, wire feeding and spheroidizing, and directly butting a coreless air pressure heat-preservation pouring furnace with a multi-station centrifugal casting machine to carry out large-batch, stable and continuous casting production.
The wire feeding spheroidization process adopts the wire feeding spheroidization device, the wire feeding spheroidization device has high automation degree, and the spheroidization process can be accurately controlled, so that the artificial influence of the spheroidization process is reduced. Nitrogen can be filled into the coreless air pressure heat-preservation pouring furnace used in the pouring process, the spheroidization recession can be avoided within 1 hour under the protection of the nitrogen, and new spheroidized molten iron can be continuously supplemented into the coreless air pressure heat-preservation pouring furnace continuously for matching the production of a multi-station centrifugal casting machine.
The method has the advantages of high efficiency of process steps, good product quality, good continuity and stable and continuous production process; the wire feeding spheroidization method is used for spheroidization, so that the artificial influence in the spheroidization process is reduced; the coreless air pressure heat-preservation pouring furnace is used, molten iron after spheroidization can be continuously injected into the multi-station centrifugal pouring machine for a long time, the production efficiency is guaranteed, the yield is improved, and the production cost is reduced. The method can realize batch production, has high efficiency, high quality and low cost, and meets the requirements of future engines on cylinder sleeve products.
Compared with the prior art, the invention has the beneficial effects that:
the invention has simple process and convenient operation; the wire feeding spheroidization method is used for spheroidization, so that the artificial influence of the spheroidization process is reduced; the coreless air pressure heat-preservation pouring furnace is used, molten iron after spheroidization can be continuously injected into the multi-station centrifugal pouring machine for a long time, the yield is improved, the production cost is reduced, and batch production is realized while the production efficiency is ensured.
Detailed Description
The present invention will be further described with reference to specific examples, which are illustrative of the invention and are not to be construed as limiting the invention.
Example 1
A method for centrifugally casting a high-strength nodular cast iron cylinder sleeve comprises the following steps:
(1) preparing materials: the raw materials comprise, by weight, 3.6% of carbon, 2.3% of silicon, 0.7% of manganese, 0.06% of phosphorus, 0.02% of sulfur, 0.05% of chromium, 0.3% of molybdenum, 1.0% of nickel, 0.1% of copper and the balance of iron; obtaining furnace burden of the nodular cast iron cylinder sleeve;
(2) smelting: smelting the nodular cast iron cylinder sleeve furnace charge by using an intermediate frequency furnace, wherein the smelting temperature is 1525 ℃, and obtaining molten iron before spheroidization;
(3) spheroidizing: carrying out spheroidization on the molten iron before spheroidization by using a wire feeding spheroidization method to obtain spheroidized molten iron; the wire feeding spheroidization method comprises the following steps of adding molten iron before spheroidization into a ladle for wire feeding spheroidization, and automatically transferring the ladle into a wire feeding spheroidization treatment station for spheroidization; the wire feeding speed of the core-spun yarn is 15 m/min; the cored wire reacts with molten iron to roll the molten iron; the total wire feeding amount of the core-spun yarn is 0.6 percent of the total amount of the molten iron before spheroidization, and the spheroidization is finished after the wire feeding is finished; the temperature of the molten iron after spheroidizing is 1425 ℃.
(4) Pouring: introducing the spheroidized molten iron into a coreless air pressure heat-preservation pouring furnace, and injecting the spheroidized molten iron into a multi-station centrifugal pouring machine through the coreless air pressure heat-preservation pouring furnace; pouring into a pouring mold by a multi-station centrifugal casting machine to obtain a cylinder sleeve casting; the temperature in the coreless air pressure heat preservation pouring furnace is kept at 1400 ℃, and nitrogen is introduced into the coreless air pressure heat preservation pouring furnace; the centrifugal speed of the multi-station centrifugal casting machine when casting into the casting mould is 600 r/min.
(5) Cooling and heat preservation: after demolding the cast cylinder sleeve casting, cooling to 370 ℃; placing the cooled cylinder sleeve casting into a heat preservation furnace for heat preservation, wherein the heat preservation time is 70 minutes, and discharging the cylinder sleeve casting when the heat preservation temperature is not more than 300 ℃; and discharging to obtain a finished product of the nodular cast iron cylinder sleeve.
Example 2
A method for centrifugally casting a high-strength nodular cast iron cylinder sleeve comprises the following steps:
(1) preparing materials: the raw materials comprise, by weight, 4.0% of carbon, 2.6% of silicon, 0.9% of manganese, 0.03% of phosphorus, 0.025% of sulfur, 0.07% of chromium, 0.7% of molybdenum, 0.9% of nickel, 0.15% of copper, and the balance of iron; obtaining furnace burden of the nodular cast iron cylinder sleeve;
(2) smelting: smelting the nodular cast iron cylinder sleeve furnace charge by using an intermediate frequency furnace, wherein the smelting temperature is 1500 ℃, and obtaining molten iron before spheroidization;
(3) spheroidizing: carrying out spheroidization on the molten iron before spheroidization by using a wire feeding spheroidization method to obtain spheroidized molten iron; the wire feeding spheroidization method comprises the following steps of adding molten iron before spheroidization into a ladle for wire feeding spheroidization, and automatically transferring the ladle into a wire feeding spheroidization treatment station for spheroidization; the wire feeding speed of the core-spun yarn is 10 m/min; the cored wire reacts with molten iron to roll the molten iron; the total wire feeding amount of the core-spun yarn is 0.75 percent of the total amount of the molten iron before spheroidization, and the spheroidization is finished after the wire feeding is finished; the temperature of molten iron after spheroidizing is 1450 ℃; the core-spun yarn is a rare earth ferrosilicon magnesium alloy core-spun yarn.
(4) Pouring: introducing the spheroidized molten iron into a coreless air pressure heat-preservation pouring furnace, and injecting the spheroidized molten iron into a multi-station centrifugal pouring machine through the coreless air pressure heat-preservation pouring furnace; pouring into a pouring mold by a multi-station centrifugal casting machine to obtain a cylinder sleeve casting; the temperature in the coreless air pressure heat preservation pouring furnace is kept at 1420 ℃, and nitrogen is introduced into the coreless air pressure heat preservation pouring furnace; the centrifugal speed of the multi-station centrifugal casting machine when casting into the casting mould is 625 r/min.
(5) Cooling and heat preservation: after demolding the cast cylinder sleeve casting, cooling to 420 ℃; placing the cooled cylinder sleeve casting into a heat preservation furnace for heat preservation, wherein the heat preservation time is 100 minutes, and discharging the cylinder sleeve casting when the heat preservation temperature is not more than 300 ℃; and discharging to obtain a finished product of the nodular cast iron cylinder sleeve.
Example 3
A method for centrifugally casting a high-strength nodular cast iron cylinder sleeve comprises the following steps:
(1) preparing materials: the raw materials comprise, by weight, 3.8% of carbon, 2.0% of silicon, 0.6% of manganese, 0.05% of phosphorus, 0.018% of sulfur, 0.08% of chromium, 0.5% of molybdenum, 1.0% of nickel, 0.2% of copper and the balance of iron; obtaining furnace burden of the nodular cast iron cylinder sleeve;
(2) smelting: smelting the nodular cast iron cylinder sleeve furnace charge by using an intermediate frequency furnace, wherein the smelting temperature is 1550 ℃, and obtaining molten iron before spheroidization;
(3) spheroidizing: carrying out spheroidization on the molten iron before spheroidization by using a wire feeding spheroidization method to obtain spheroidized molten iron; the wire feeding spheroidization method comprises the following steps of adding molten iron before spheroidization into a ladle for wire feeding spheroidization, and automatically transferring the ladle into a wire feeding spheroidization treatment station for spheroidization; the wire feeding speed of the core-spun yarn is 18 m/min; the cored wire reacts with molten iron to roll the molten iron; the total wire feeding amount of the core-spun yarn is 0.7 percent of the total amount of the molten iron before spheroidization, and the spheroidization is finished after the wire feeding is finished; the temperature of molten iron after spheroidization is 1400 ℃; the core-spun yarn is a rare earth ferrosilicon magnesium alloy core-spun yarn.
(4) Pouring: introducing the spheroidized molten iron into a coreless air pressure heat-preservation pouring furnace, and injecting the spheroidized molten iron into a multi-station centrifugal pouring machine through the coreless air pressure heat-preservation pouring furnace; pouring into a pouring mold by a multi-station centrifugal casting machine to obtain a cylinder sleeve casting; keeping the temperature in the coreless air pressure heat-preservation pouring furnace at 1380 ℃, and introducing nitrogen into the coreless air pressure heat-preservation pouring furnace; the centrifugal speed of the multi-station centrifugal casting machine when casting into the casting mould is 650 r/min.
(5) Cooling and heat preservation: after demolding the cast cylinder sleeve casting, cooling to 470 ℃; placing the cooled cylinder sleeve casting into a heat preservation furnace for heat preservation, wherein the heat preservation time is 120 minutes, and discharging the cylinder sleeve casting when the heat preservation temperature is not more than 300 ℃; and discharging to obtain a finished product of the nodular cast iron cylinder sleeve.
Comparative example
(1) Preparing materials: the raw materials comprise, by weight, 3.6% of carbon, 2.3% of silicon, 0.7% of manganese, 0.06% of phosphorus, 0.02% of sulfur, 0.05% of chromium, 0.3% of molybdenum, 1.0% of nickel, 0.1% of copper and the balance of iron; obtaining furnace burden of the nodular cast iron cylinder sleeve;
(2) smelting: smelting the nodular cast iron cylinder sleeve furnace charge by using an intermediate frequency furnace, wherein the smelting temperature is 1525 ℃, and obtaining molten iron before spheroidization;
(3) preserving heat of a cored heat preserving furnace, namely preserving heat of molten iron before spheroidization by using the cored heat preserving furnace, wherein the heat preservation temperature is 1400 ℃;
(4) spheroidizing: spheroidizing the molten iron before spheroidization after heat preservation in the step (3) by using a flushing method to obtain spheroidized molten iron;
(5) pouring: conveying the spheroidized molten iron into a multi-station centrifugal casting machine for casting production to obtain a cylinder sleeve casting; the centrifugal speed of the multi-station centrifugal casting machine when casting into the casting mould is 600 r/min;
(6) cooling and heat preservation: after demolding the cast cylinder sleeve casting, cooling to 370 ℃; placing the cooled cylinder sleeve casting into a heat preservation furnace for heat preservation, wherein the heat preservation time is 70 minutes, and discharging the cylinder sleeve casting when the heat preservation temperature is not more than 300 ℃; and discharging to obtain a finished product of the nodular cast iron cylinder sleeve.
The production of the ductile iron cylinder liner was carried out according to the procedures of example 1 and comparative example, respectively, and the data in table 1 were obtained.
TABLE 1 comparison of nodular cast iron cylinder liner process of the example and the comparative example
According to the table, the quality detection qualification rate and the casting production efficiency of the nodular cast iron cylinder sleeve produced according to the process of the embodiment are higher than those of the traditional process in the comparative example; and the casting rejection rate of the nodular cast iron cylinder sleeve produced by the process of the embodiment is far lower than that of the traditional process of the comparative example.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (10)
1. A method for centrifugally casting a high-strength nodular cast iron cylinder sleeve is characterized by comprising the following steps: the method comprises the following steps:
(1) preparing materials: proportioning according to the raw material components of the nodular cast iron cylinder sleeve to obtain furnace burden of the nodular cast iron cylinder sleeve;
(2) smelting: smelting the nodular cast iron cylinder sleeve furnace charge by using an intermediate frequency furnace to obtain molten iron before spheroidization;
(3) spheroidizing: carrying out spheroidization on the molten iron before spheroidization by using a wire feeding spheroidization method to obtain spheroidized molten iron;
(4) pouring: introducing the spheroidized molten iron into a coreless air pressure heat-preservation pouring furnace, and injecting the spheroidized molten iron into a centrifugal pouring machine through the coreless air pressure heat-preservation pouring furnace; pouring into a pouring mold by a centrifugal pouring machine to obtain a cylinder sleeve casting;
(5) cooling and heat preservation: cooling the cylinder sleeve casting, and then putting the cylinder sleeve casting into a heat preservation furnace for heat preservation; and (5) after heat preservation, obtaining the nodular cast iron cylinder sleeve.
2. The method of centrifugally casting a high-strength ductile iron cylinder liner according to claim 1, wherein: the nodular cast iron cylinder sleeve is prepared from the following raw materials in percentage by weight: 3.6-4.0% of carbon, 2.0-2.6% of silicon, 0.6-0.9% of manganese, less than or equal to 0.06% of phosphorus, less than or equal to 0.025% of sulfur, less than or equal to 0.08% of chromium, 0.3-0.7% of molybdenum, 0.9-1.0% of nickel, 0.1-0.2% of copper and the balance of iron.
3. The method for manufacturing a centrifugally cast high-strength ductile iron cylinder liner according to claim 1, characterized in that: in the smelting process of the step (2), the smelting temperature is 1500-1550 ℃.
4. The method for manufacturing a centrifugally cast high-strength ductile iron cylinder liner according to claim 1, characterized in that: in the spheroidizing process in the step (3), a wire feeding spheroidizing device is used for spheroidizing the molten iron before spheroidizing; and the spheroidization process adopts core-spun yarns for spheroidization.
5. The method for manufacturing a centrifugally cast high-strength ductile iron cylinder liner according to claim 4, characterized in that: the wire feeding spheroidization method comprises the following steps of adding molten iron before spheroidization into a ladle for wire feeding spheroidization, and automatically transferring the ladle into a wire feeding spheroidization treatment station for spheroidization; the wire feeding speed of the core-spun wire is 10-20 m/min; the cored wire reacts with molten iron to roll the molten iron; the total wire feeding amount of the core-spun yarn is 0.6-0.75% of the total amount of the molten iron before spheroidization, and the spheroidization is finished after the wire feeding is finished; the temperature of molten iron after spheroidizing is 1400-1450 ℃.
6. The method for manufacturing a centrifugally cast high-strength ductile iron cylinder liner according to claim 5, characterized in that: the core-spun yarn is a rare earth ferrosilicon magnesium alloy core-spun yarn.
7. The method for manufacturing a centrifugally cast high-strength ductile iron cylinder liner according to claim 1, characterized in that: and (4) in the casting process of the step (4), keeping the temperature in the coreless air pressure heat-preservation casting furnace at 1380-1420 ℃, and introducing nitrogen into the coreless air pressure heat-preservation casting furnace for protection.
8. The method for manufacturing a centrifugally cast high-strength ductile iron cylinder liner according to claim 7, characterized in that: the centrifugal speed of the centrifugal casting machine in casting into the casting mould is 600-650 r/min.
9. The method for manufacturing a centrifugally cast high-strength ductile iron cylinder liner according to claim 8, characterized in that: the centrifugal casting machine is a multi-station centrifugal casting machine.
10. The method for manufacturing a centrifugally cast high-strength ductile iron cylinder liner according to claim 1, characterized in that: after demolding the cast cylinder sleeve casting, cooling to 300-500 ℃; placing the cooled cylinder sleeve casting into a heat preservation furnace for heat preservation, wherein the heat preservation time is 60-180 minutes, and discharging the cylinder sleeve casting when the heat preservation temperature is not more than 300 ℃; and discharging to obtain a finished product of the nodular cast iron cylinder sleeve.
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Application publication date: 20200821 |